Piperidine spiro compounds

ABSTRACT

THE PIPERIDINE SPIRO COMPOUNDS OF THE FORMULA; WHERIN X IS H, CL, CH3-, CF3, CH3O-,CH3-OR CH3CO; Y IS-S-OR-CH2CH2-; ALK IS ALKYLENE OF 2 TO 4 CARBON ATOMS (E.G. ETHYLENE, PROPYLENE, TRIMETHYLENE OR 2-METHYLTRIMETHYLENE); A IS METHYLENE, ETHYLENE OR ETHYLIDENE; AND R IS H OR LOWER ALKYL OF AT MOST 4 CARBON ATOMS (E.G.METHYL, ETHYL, PROPYL OR BUTY) ARE USEFUL AS TRANQUILIZERS.   PHENYLENE)-Y-1,2-PHENYLENE)   (4,4-(-S-A-CO-N(-R)-)PIPERIDINO)-ALK-N&lt;(-(5-X-1,2-

United States Patent Int. Cl. C07d 93/06, 29/120 US. Cl. 260-243 R 8 Claims ABSTRACT OF THE DISCLOSURE The piperidine spiro compounds of the formula:

. S-A t l V N o X s wherein X is H, Cl, CH CF CH O--, CH or CH CO; Y is S- or CH CH alk is alkylene of 2 to 4 carbon atoms (e.g. ethylene, propylene, trimethylene or 2-methyltrimethylene); A is methylene, ethylene or ethylidene; and R is H or lower alkyl of at most 4 carbon atoms (e.g. methyl, ethyl, propyl or butyl) are useful as tranquilizers.

This application is a divisional application of Ser. No. 839,046, filed July 3, 1969, now US. Pat. No. 3,574,204, which in turn is a continuation-in-part application of Ser. No. 675,074, filed Oct. 13, 1967, now abandoned.

This invention relates to therapeutically useful piperidine spiro compounds of the formula:

alk-N is expressed by -Z in the following disclosure.

Compounds (I) can be prepared (i) by reacting a compound of the formula wherein M is H or alkali metal (optimally Na) with a compound of the formula 3,651,052 Patented Mar. 21, 19 72 ice it (II) wherein Q is a reactive radical (optimally a halogen, e.g. Cl, Br or I, or reactive acid residue, e.g. -SO OH,

acetoxycarbonyloxy, methylsulfonyloxy, p-tolylsulfonyloxy), (ii) by reacting a compound of the formula ZalkQ (Q being the same as above mentioned) with a compound of the formula S-A HN: X J:

=0 R or (iii) by reacting a compound of the formula with a compound of the formula HS-A-COOH and a compound of the formula or a salt thereof (e.g. ammonium carbonate).

These reactions are carried out in a solvent, and are facilitated at an elevated temperature of about 50 to about 200 C., especially at about the boiling point of the solvent. Most suitable solvents for reaction (i) are aromatic hydrocarbons such as Xylene, for reaction (ii) alcohols such as ethanol, and for reaction -(iii) solvents such as benzene which permit azeotropic removal of water formed. Any other suitable solvents such as methanol, propanol, isopropanol, butanol, acetone, methyl ethyl ketone, methyl but'yl ketone, cyclohexanone, toluene, chlorobenzene, tetrahydrofuran, dioxane, diethyl ether, pyridine and liquid ammonia may also be used depending on the kinds of starting materials and reaction conditions. Acid acceptors such as alkali hydroxides, alkali carbonates and tertiary amines (e.g. pyridine, triethylamino) may be used for reactions (i) and (ii).

Piperidine spiro compounds (I) can form pharmaceutically acceptable acid addition salts with various inorganic and organic acids such as hydrochloric, hydrobromic, sulfuric, maleic, fumaric, tartaric acid and S0 on.

Starting materials (III) are new and can be prepared, for example, by reacting 4-oxopiperidine with a compound of the formula R-NH (R being as above defined) or a salt thereof (e.g. ammonium carbonate) and a compound of the formula -HSACOOH (A being as above defined). This procedure is described in J. Am. Chem. Soc. 76, 578-5 (1954) and J. Am. Chem. Soc. 80, 3469-3471 (1958). The reaction proceeds as follows:

HN ==O (NHihCOa HSCH COOH S-CH;

For example, 13.8 g. of 4-oxopiperidine hydrochloride is suspended in 15 ml. of ethanol, and 400 ml. of benzene, 14 g. of ammonium carbonate and 11 g. of thioglycolic acid are added thereto. The mixture is refluxed with stirring for 18 hours in a flask connected with a water removing adapter. The reaction mixture is cooled and the solvent distilled off under reduced pressure to leave a reddish brown solid, which is suspended in 30 ml. of water. Then the suspension is saturated with sodium carbonate and extracted with chloroform. The chloroform layer is dried over anhydrous sodium sulfate and the solvent is distilled olT under reduced pressure to leave a yellowish white solid, which is recrystallized from ethanol to give 5.5 g. of 3-oxo-1-thia-4,8-diazaspiro[4.5]decane as white needles melting at 235 to 236 C. If it is desired to prepare the compound ('I) wherein 'R is lower alkyl of at most 4 carbon atoms, then the (NH CO in the foregoing reaction would be replaced by a compound of the formula (alk being as above defined) or by reacting (Illl) with a haloalkanol of the formula HO--alkhalogen followed by esterifying, e.g. with p-toluenesulfonyl chloride. This procedure is described in Chem. Abstr. 62, 1463-8h Bull. Soc. Chim. France, 1968, 3246 and US. Pat. 3,359,265. The reaction proceeds as follows:

S-CH: HN: X L

For example, a mixture of 8.6 g. of 3-oxo-l-thia-4,8-diazaspiro[4.5]decane, 9.5 g. of 1-bromo-3-chloropropane, 7 g. of potassium carbonate, 50 ml. of dimethylformamide and 50 ml. of ethanol is heated with stirring at 60 C. for 18 hours. After cooling, the insoluble matter is filtered off and the filtrate is concentrated under reduced pressure. Ethyl acetate is added to the residue and the solution is extracted with hydrochloric acid. The aqueous layer is made alkaline with sodium hydrogen carbonate and is extracted with chloroform. The organic layer is washed with water, dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The yellowish brown product thus obtained is recrystallized from isopropanol to give 5.1 g. of 8-(3-chloropropyl)-3-oxo-1-thia-4,8-diazaspiro[4.5]decane melting at 158to 160 C. If it is desired to prepare the compound (I) wherein R is lower alkyl of at most 4 carbon atoms, then the H atom attached to the nitrogen atom adjacent to the carbonyl group in the foregoing reaction scheme would be replaced by an alkyl group of at most 4 carbon atoms.

The piperidine spiro compounds (I) of the invenion are useful as tranquilizers. 8-[3-(2-chloro-10-phenothiazinyl)-propyl]-3-oxo-l-thia 4,8 diazaspiro[4.5]decane hydrochloride (Compound A), 3-oxo-8-[3-(2-trifluoromethyl 10 phenothiazinyD-propylJ-1-thia-4,8-diazaspiro [4.5]decane hydrochloride (Compound B), 8-[3-(2- acetyl 10 phenothiazinyDpropyl] 3 oxo-1-thia-4,8-diazaspiro[4.5]decane (Compound C) and 4oxo-9-[3-(2- trifiuoromethyl 10 phenothiazinyDpropyl]-1-thia-5,9- diazaspiro[5.5]undecane (Compound D), for example, have the following pharmacological properties (given in terms of median effective dose (ED in mg./kg. and median lethal dose (LD in mg./kg.):

The piperidine spiro compounds (I) as well as the pharmaceutically acceptable acid addition salts thereof can be administered safely, in the form of tablets, as tranquilizers e.g. for schizophrenia or mania, the usual dose for adults being 50 to 300 mg., i.e. 2 to 12 tablets,

7 each tablet containing 25 mg. of the compound (I), per

person per day. The tablets each may comprise e.g.:

Mg. Compound (I) ..2 25 Lactose 54 Starch 15 Sodium salt of carboxymethylcellulose 2 Talc 26 Magnesium stearate 1 Refined sucrose 73.5 Acacia 2.2 Calcium carbonate- 11.2 Beeswax 0.1

Total 210 The tablets may be sugar-coated.

In the following illustrative examples presently preferred embodiments of the invention, stands for gram(s).

EXAMPLE 1 10 g. of phenothiazine is allowed to react-in liquid ammonia with sodium amide prepared from 1.4 g'. of sodium. Then the ammonia is replaced by xylene. To the xylene solution is added dropwise a solution of 15 g. of 8-(3-chloropropyl)-3-oxo-1-thia-4,8-diazaspiro[4.5]decane in ml of Xylene, taking'about an hour, while heating at to C. Then heating (130 to 140 C.) is continued for a further one hour. The mixture is cooled, washed with water and dried over sodium sulfate. The xylene is distilled off to leave an oily residue, which is then dissolved in ether. Dry hydrogen chloride gas is introduced into the ether solution to precipitate 12 g. of 3 oxo-8-[3-(10-phenothiazinyl)propyl]-1-thia-4,8-diazaspiro[4.5]decane hydrochloride melting at 197 to 198 C. (decomposition).

of typical and 66s.!

EXAMPLE 2 3.1 g. of 2-chlor0-10-(3-ch10ropropyl)phenothiazine and 2.1 g. of 3-oxo-l-thia-4,8-diazaspiro[4.5]decane are dissolved in 100 ml. of ethanol, and 3 g. of potassium car: bonate is added to the solution.'The mixture is refluxed for 48 hours. Then the solvent is distilled off-To the residue is added 100 ml. of water. The oil separated is extracted with benzene. The extract is dried over sodium sulfate and the solvent is distilled off under reduced pressure to give a reddish brown oily residue which is purified by column chromatography with 60 g. of activated alumina. First, the unreacted 2-chloro-10-(3-chloropropyl) phenothiazine is eluted with benzene. Then the objective product is eluted with ethyl acetate. The eluate is concentrated, and the obtained white crystals are recrystallized from acetone to give 2.4 g. of 8-[3-(2-chloro-10- phenothiazinyl)propyl] 3-oxo+1-thia-4,8-diazaspiro [4.5]

decane as white needles, melting at 154 to 156 C. Its,

5 EXAMPLE 3 I A mixture of 11.2 g. of 1-[3-(2-chloro-10-phenothiazinyl)prpyl]-4-oxopiperidine, 3 g. of thioglycolic acid, 1.8 g. of ammonium carbonate and 300 m1. of benzene is refluxed with stirring for 15 hours in a flask connected with a water-removing adapter. As an azeotropic mixture with benzene, 1.3 ml. of water formed by the reaction is separated. The reaction mixture is cooled, washed with aqueous ammonia and water, and dried over sodium sulfate. The benzene is distilled oil under reduced pressure to leave a reddish brown residue which is crystallized from acetone to give 6.5 g. of 8-[3-(2-chloro-10-phenothiazinyl)propyl] 3 oxo-1-thia-4,8-diazaspiro[4.5]decane as white needles melting at 154 to 156 C.

EXAMPLE 4 EXAMPLE 5 20.3 g. of 1-[3-(2-trifluoromethyl-10-phenothiazinyl) propyl]-4-oxopiperidine, 6 g. of 3-mercaptopropionic acid and 5.5- g. of ammonium carbonate are heated in 400 ml. of boiling benzene for 18 hours under reflux, 2 ml. of water being separated as an azeotropic mixture with benzene. The reaction mixture is treated as in Example 3 to give a reddish brown residue, which is purified'by column chromatography with 130 g. of activated alumina. The unreacted starting oxopiperidine is first eluted with toluene, and then the objective product is eluted with ethyl acetate. White crystals obtained by concentrating the eluate are recrystallized from isopropanol to give 4.8 g. of '4 oxo-9- [3-(2-trifluoromethyl-10-phenothiazinyl)propy1) -1-thia-5,9-diazaspiro[5.5]undecane, melting at 177 to 179 C.

EXAMPLE 6 20 g. of 1-[3-(10-phenothiazinyl)propyl]-4-oxopiperidine, 6.5 g. of thioglycolic acid'and 5.2 g. of propylamine are heated in 400 ml. of boiling benzene and the reaction mixture is treated as in Example 3 to give a reddish brown residue, which is purified by column chromatography as in Example 5. The reddish brownoily product obtained by concentrating the ethyl acetate eluate is converted to the crystalline oxalate, and the crystals are recrystallized from isopropanol to give 4.1 g. of 3-oxo-8-[3-(10-phenothiazinyl)propyl] 4-propyl-l-thia-4,8-diazaspiro[4.5]decane oxalate, C H N S O- A (C H O melting at 208 to 209 C. (decomposition).

EXAMPLES 7-26 In the same manner as in Examples 1 to 6, the following piperidine spiro compounds (I) are produced:

( 12') 8- [3 (Z-methylthio-10-phenothiazinyl) propyl] -3- oxo-1-thia-4,8-diazaspiro[4.5]decane hydrochloride, melting at 220 to 223 C. (decomposition);

( 13) 8- [3- (2-acetyl-10-phenothiazinyl)propyl] -3 -oxo 1-thia-4,8-diazaspiro[4.5]decane, melting at to 152 C.; i

(14) 8-[ 1-methyl-2-( 10-phenothiazinyl) ethyl] -3-oxo-1- thia-4,8-diazaspiro[4.5] decane hydrochloride, melting at 225 to 227 C. (decomposition);

( 15 8- 3 (2-methoxy-10-phenothiazinyl -2-methylpropyl]-3-oxo-thia-4,8-diazaspiro[4.51decane, melting at 192 to 194 C;

( 16) 4oxo-9- [3-( 10-phenothiazinyl)propyl] -1-thia-5,9- diazaspiro[5.5]undecane, melting at 195 to 196 C;

( 17) 9-[3-(2-ch1oro-10-phenothiazinyl)propyl]-4-oxo- 1-thia-5,9-diazaspiro[5.5]undecane, melting at 216 to 217 C;

( 18) 8- [3- (2-chloro-10-phenothiazinyl) propyl] -2- methyl-S-oxo-1-thia-4,8-diazaspiro [4.5] decane hydrochloride, melting at 168 to 169 C.;

( 19) 8- [3- (Z-trifluoromethyl-l 0-phenothiazinyl)propy1] 2-methyl-3-oxo-1-thia-4,8-diazaspiro[4.5]decane hydrochloride, melting at 182 to 184 C.;

(20) 8- 3- (Z-chloro-lO-phenothiazinyl) propyl] -4- methyl-3-oxo-1-thia-4,8-diazaspiro [4.5 decane hydrochloride, melting at 200 to 202 C. (decomposition);

(21 8- [3-(2-chloro-10-phenothiazinyl) propyl] -4-ethyl- 3-oxo-1-thia-4, 8-diazaspiro[4.5]decane oxalate, melting at 188 to 190 C. (decomposition);

(22) 4-butyl-8-[3-(2-chloro-l0-phenothiazinyl)propyl]- 3-oxo-l-thia-4,8-diazaspiro[4.5]decane oxalate, melting at 144 to 146 C. (decomposition);

(23) 8-[3-(10,11-dihydro-5H-dibenz[b,f]azepin-S-yl) propyl] -3-oxo-1-thia-4,8-diazaspiro [4.5 decane hydrochloride, melting at 241 to 243 C. (decomposition);

(24) 8-[3-(10,1l-dihydro-SH-dibenz[b,f]azepin-5-yl) propyl] -2-methyl-3 -oxo-1-thia-4,-8-diazaspiro [4.5] decane hydrochloride, melting at 273 to 275 C. (decomposition) (25 9-[3-(10,11-dihydro-5H-dibenz[b,f]azepin-S-yl) propyl]-4-oxo-1-thia-5,9-diazaspiro[5.5]undecane hydrochloride, melting at 249 to 252 C. (decomposition); and

(26) 8-[3-(10,11-dihydro-5H-dibenz[b,f]azepin-S-yl) propyl] -4-methyl-3-oxol-thia-4,8-diazaspiro [4.5 decane hydrochloride, melting at 236 to 239 C. (decomposition) Any of the foregoing compounds as exemplified in the examples wherein the hydrochloride or oxalate salt is prepared may also be utilized in the form of the corresponding free base. For example, the compound of Example 25 may be converted to and utilized as 9-[3-(10, ll dihydro 5H dibenz[b,f]azepin-5-yl)propyl]-4- oxo-1-thia-5,9-diazaspiro[5.5]undecane, and the compound of Example 26 may be converted to and utilized as 8 [3 (10,11 dihydro 5H dibenz[b,f]azepin-5-yl) propyl] 4 methyl 3 oxo-1-thia-4,8-diazaspiro[4.5] decane.

What is claimed is:

1. A compound of the formula S-A -O l CH C 5 3. A "compound according to claim 1, namely, 8-[3- (10,11 dihydro 5H dibenz[b,f] azepin-5-yl)propyl]-3- oxo-1-thia-4,8-diazaspiro[4.5]decane.

4. A compound according to claim 1, namely, 8-[3- 10,11 dihydro 5H dibenz [b,f] azepin-5-yl)propyl] -2- methyl-3 -oxo'-1-thia-4,-8-diazaspiro [4.5 decane;

5. A- compound according the claim '1, namely, 9'-[3- (10,11 dihydro 5H dibenz[b,f]azepin-5-y1)propyl]- 4-oxo-1-thia-5,9-diazaspiro[5.5]undecane.

6. A compound according to claim 1, namely, 8-[3- (10,11 dihydro 5H dibenz[b,f] azepi'n-5-yl)propyl]-4- methyl-3-oxo-l-thia-4,8-diaza'spiro[4.5']decane.

7. A compound according to claim 2, namely, 9-[3- (10,11 dihyd-ro 5H dibenz[b,f]azepin-5-yl)propyl]- 4-oxo-1-thia-5,9-diazaspiro[5.5]undecane hydrochloride. 15

I References Cited" UNITED STATES PATENTS 3,574,204 4/1971 Nakanishi et a1. 260-'24 3 0 JOHN M. FORD, Primary Examiner US. Cl. X.R.v 

